JPH04253843A - Electrocardiogram analyzer - Google Patents

Abstract

PURPOSE:To enable analysis of a cardiogram signal at a high accuracy by arranging a filter adapted to stress a signal component alone of an R wave in an electrocardiogram signal amplified and a threshold value generating section which allows the altering of a level of a threshold value from outside to alter a threshold level for detecting the R wave by a direction from an operator. CONSTITUTION:An electrocardiograph signal from a person to be inspected is amplified with an input amplifying section 1 and digitized with an A/D conversion part 2 to be inputted into a central processing section 7. The signal amplified with the input amplifying section 1 is converted with a filter section 3 into a signal stressing a signal component alone of an R wave. On the other hand, a signal of a threshold value generating section 5 is compared with an output signal of the filter section 3 by means of an R wave detecting section 4 to detect the R wave. The R wave detecting section 4 outputs a signal to the central processing section 7 and after an analysis, the signal is recorded and displayed according to a direction from an operating section 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an electrocardiogram analysis device,
In particular, the present invention relates to an electrocardiogram analysis device equipped with an R-wave detection circuit.

0002

[Prior Art] The R-wave detection circuit of a conventional electrocardiogram analyzer amplifies an electrocardiogram signal (FIG. 2(a)) using an input amplifier.
This waveform is passed through a filter that emphasizes the R-wave signal component (Fig. 2(b)), and is compared with a certain threshold.
Figure 2(c)) was output. Based on this, the central processing section recognizes the waveform of the A/D-converted digital signal of the signal amplified by the input amplifier section, performs diagnosis, and outputs the record to the recorder.

0003

[Problems to be Solved by the Invention] In conventional electrocardiogram analyzers, the analysis accuracy depends on the detection accuracy of R waves.
Detection of the R wave was configured to detect the R wave using a certain predetermined threshold. Because the threshold value is constant, for a wide variety of electrocardiogram input waveforms, detection of R waves is often neglected, or steep T waves are mistakenly detected as R waves. For this reason, the accuracy of the analysis was not sufficient.

0004

[Means for Solving the Problems] The electrocardiogram analysis device of the present invention includes an input amplifier section that amplifies an electrocardiogram signal of a subject, and an A/D conversion section that converts the electrocardiogram signal amplified by the input amplifier section into a digital signal. a filter section that emphasizes only the R-wave signal component in the output signal of the input amplifier section; a threshold generation section whose threshold level can be externally changed; and an output of the threshold generation section and the filter section. An R wave detection unit that compares and detects R waves, a display unit that displays electrocardiogram signals and R wave detection information, a recording unit that records electrocardiogram signals and analysis results, and overall operation control and analysis. and an operation section for instructing the threshold level of the threshold value generating section.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[0006] An electrocardiogram signal from a subject is amplified by an input amplifier section 1, digitized by an A/D conversion section 2, and input to a central processing section 7. Further, the signal amplified by the input amplifier section 1 is converted by the filter section 3 into a signal in which only the R wave signal component is emphasized. On the other hand, the signal of the threshold generation section 5 which generates the threshold level set according to the instruction of the central processing section 7 is compared with the output signal of the filter section 3 to detect the R wave.
This is performed by the wave detection section 4.

The central processing unit 7 receives instructions from the operator from the operating unit 8, controls the apparatus, displays the electrocardiogram waveform and R wave detection status on the display unit 6, and displays the electrocardiogram waveform and R wave detection status on the display unit 6. The digitized electrocardiogram signal is analyzed based on the R-wave detection signal from the R-wave detection section 4, and the results are controlled to be output to the recording section 9 together with the waveform.

Next, the setting of the threshold level for R wave detection will be explained in detail.

FIG. 2 is a diagram showing the R wave detection procedure. The electrocardiogram signal (a) is amplified by the input amplifier section 1, and the filter section 3 generates a signal (b) in which the R-wave signal component is emphasized. This signal is compared with a threshold level set by the threshold generation section 5, and a point exceeding the threshold level is set as an R wave detection point to generate an R wave detection signal (c). In this situation, the display section 6 displays the current heart rate, marks, etc.
This will be communicated to the operator by doing this. The operator checks whether this is synchronized with the electrocardiogram waveform display.

[0010] If the input electrocardiogram signal has a low potential, R waves may not be detected. In this case, by instructing the central processing section 7 to lower the threshold level using the operation section 8, the level of the threshold generation section 5 is changed, and the R wave is detected. The operator confirms this by checking the electrocardiogram waveform and R wave detection status on the display unit 6.

[0011] Furthermore, the T wave of the input electrocardiogram signal is steep and R
It may be mistakenly detected as a wave. In this case, the operation section 8
By instructing the central processing unit 7 to raise the threshold level, the level of the threshold generating unit 5 is changed, and R
Eliminates false detection of waves. The operator confirms this on the display section 6.

0012

Effects of the Invention As explained above, the present invention allows the threshold level for detecting R waves to be changed by the operator's instructions, so that it is possible to detect R waves at low potential for a wide variety of electrocardiogram signals. This has the effect of eliminating undetected R waves and erroneous detection of R waves due to steep T waves, making it possible to obtain highly accurate analysis results.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing some signal waveforms of the embodiment shown in FIG. 1;

[Explanation of symbols]

1 Input amplifier section 2 A/D conversion section 3 Filter section 4 R wave detection section 5 Threshold generation section 6 Display section 7 Central processing section 8 Operation section 9 Recording Department

Claims (1)

[Claims] 1. An input amplifier section that amplifies an electrocardiogram signal of a subject; an A/D conversion section that converts the electrocardiogram signal amplified by the input amplifier section into a digital signal; A filter unit that emphasizes only the signal component of the R wave, a threshold generation unit whose threshold level can be changed externally, and the outputs of the threshold generation unit and the filter unit are compared.
R-wave detection unit that detects electrocardiogram signals and R-waves.
a display section that displays wave detection information, a recording section that records electrocardiogram signals and analysis results, a central processing section that controls and analyzes the overall operation, and an operation section that instructs the threshold level of the threshold generation section. An electrocardiogram analysis device comprising: